Magnetic chuck



Jan. 20, 925.

MAGNETI C CHUCK Filed March 5l, 1921 IJ. 12 `.fa r I 2 J7 do C wwwmleither directly or through the resistance Patented Jan. ZG, 1925.

" STATES BENGT M. W. HANSON, Oli"l-EAB'FFOBDv.` CONNECTICUT.

. MAGNETIC CHUCK.

Applicaition filed March 31, 1921. Serial No. 457,338.

To all whom t may concer/a.'

Be it known that BENGT M. W. HANsoN, a citiz'enof the United States, and resident of Hartford, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in a Magnetic Chuck,

each of which may be separately magnetized and the magnetic effects separately controlled. The embodiment of the invention selected for illustration and description is of arotary spindle with parts constituting the magnetic chuck built directly into the end of the spindle, and the disclosure of the invention will be based upon this embodiment. lt will, of course, be evident that the invention, as set forth in the appended claims, 1s susceptible of use in vother arrangements than that herein illustrated.

1n the drawing Fig. 1 is a central vertical section of a chuck made in accordance with my invention, and taken on line 1 1 of Fig. 2 and Fig. 2 is an end view thereof.

Fig. 3 vis an enlarged detail view taken on line 3-3 of Fig. 2.

Referring to the drawing, a isa bearing and b is a chuck rotatably mounted therein driven from some suitable source of power as through the gear 0. The end of the spindle constitutes a chuck face and, as here shown, is made upA of two parts, an outer section 2 with ha central recess within which is. fitted a central chuch block 6 which con` stitutes the inner or central section of the chuck face" and is removably positioned therein and may be held in place as by-the screw bolts-7.

10 denotes a magnetizing Ccoil fitted into the central chuck block 6 and connected through the contact members 11 with circuit wires leading to contacts 12, 12, at the rear of the spindle which are rovided with brushes 13, 13a in the circuit o one of which a resistance 14 is located in order that the strength of the magnetic force in the chuck block 6 can be varied for purposes which will be hereinafter described. This circuit is controlled by a proper switch 15 in order that thecurrent can be delivered tothe coil 14. denotes a magnetizing coil in the outer section 2 of the chuck face and connected by circuit wires with contact 'rings 21, 21, and brushes 22, 22., equipped with a proper switch 23 for controlling the current supplied to the coil 20.

lt will be seen from this description that the chuck face comprisestwo sections insu*- lated from one another, that each section may be separately magnetized and thatiu one of the sections, as the central one here illustrated, the magnetic 'eect can be varied.

At' the end of the outer chuck section 2 are a pair of oppositely arranged plates 30, adapted to slide towards and away from one another, being guided by pins 31, 31 riding in slots 32, 32 and held in place by the` headed screw bolts 33, 33. Angular slots 35 in the outer ends of these plates receive pins 36 carried by a ring 37 which is rotatable on the chuck, being so arranged that the rotation of this ring will cause the plates to move either outwardly or inwardly as desired.

The piece of work, here shown as a bearA ing ring a', is positioned against the central chuck block 6 and 'a light current is thrown into the coil to produce sufficient magnetism to hold the piece in place but permitting it f.

to be shifted until it is percisely centered relative to the spindle. Then, by further action of the'switch 15, the resistance is cut out, delivering more current to the coil and consequent greater magnetic efect to hold the piece in position. The adjusting ring 37 is now turned to bring the holding plates 30, 30, down into contact with the sides of the work as shown, these holding plates having V-shaped jaws so as t o firmly hold the work against movement 1n anyv direction.

llVhen these plates are brought up into contact with the work, the switch 23 is operated to throw the currentinto the'coil 20in the. outer chuck section 2 producing a very heavy magnetic effect which operates over the lar e area of the holding, plates 30 which 11e against. the end of the outer chuck section 2, thus firmly securing these holding plates against movement and so preventing any movement of the Work when the pressure of the tool is applied thereto. Y

It will be seen from the foregoing that the work is directly held by the magneth effect in the central magnetic chuck block 6, and at rst is lightly heldin order that it may be centered properlywith relation '55. a chuckface comprising a plurality of seclto the spindle, after which the full current is turned into the coil 10 in this central portion. Then the holding plates are shifted to position to holdand supportthe work against lateral displacement and current turned into the coil of the outer chuck section 2 to hold the plates 30, 30, and' so position the work with great security.

A chuck of this sort finds peculiarutility in permitting of machining a piece of work both internally and externally at the same time, where an accurate relationship between i` with two tools operating on it.- A finishing.

tool, suchas a inding Wheel, for the bore 'of the ring is s own at y and a wheel for grinding the races is shown at a. It will be apparent `that-both of these operations can be carried on simultaneously at one and the same setting of the Work, and consequently identical results will be vattained both in the bore and on the exterior of the ring, the two surfaces being of necessity precisely concentric.

Obviously, the tool for finishing the interior must be able to passbthrough the work to a substantial extent and for this reason the central chuck block is recessed as at 9.

This recess should always be a little larger than the work so that the tool as it 'runs Vthrough will not contact with the chuck block and for this reason-the entire chuck block 6 can be made removable in order to I provide a variety of sizes of recesses las may be required.

Itis, of course, obvious that my invention Vissusceptible of various modifications and 'changes which are within the spirit of the invention without departing from the scope of the following claims, it being understood that the present disclosure of my invention is .by way of illustration only and it is not to be taken as restrictive of my conception.

'I -claim as my invention: 1. Ina device of the character described,

tions and means for separately magnetizing lmagnetizing said sections, one of said sections being adapted to directlyl hold a piece of work by the magnetic effects within the said section, and supporting devices for said work associated with the other section land adapted to be held by the magnetic forces therein.

3. A device of the character descrlbed comprising a chuck face made up of separate sections with means for separately magnetlzmg said sections, one of said sections being' adapted t@ directly hold a piece of g ed to be held by the magnetic forces therein, and means for varying the magnetic effect in that section adapted to directly hold the Work.

4. A magnetic chuck comprising a pluralityof sections with means for separately magnetizing each section, work supporting plates associated with one of said sections, and means for holding said plates for sliding movement relative to said section, said plates being held against movement relative to the section with which they are associated with by themagnetic effects produced in said section. Y

A magnetic chuck comprising a pair of sections, one within the other, means for separately magnetizing said sections, the inner one of said sections bein adapted to directly hold a piece of work y the magnetic effects within said section, and plates supported for sliding movement along the face of the outer section and to and from the inner section, said plates adapted to be held against movement by the magnetic forces produced in said outer section.

6. A device of the character described comprising a chuck face made up of separate sections with means for separately` magnetizing said sections, one of said sections being adapted to directly hold a piece of work by the magnetic effects Within said section, supporting devices for said work associated with the other section and adapted to be held by the magnetic forces therein, and means for moving said devices in unlson.

7. A magnetic chuck com rising a pair of sections, one within the ot er, means for separately magnetizing said sections, the inner one of said sectionsbeing adapted to directly hold a piece of work bythe magnetic effects within said section, plates supported for sliding movement along the face of the outer section and to and from the inner section,and means for moving said plates in unison, said plates adapted to be eld against movement by the magnetic forces produced in said outer section.

8. A, magnetic chuck comprising a pair of sections, one within the other, means for separately magnetizing said sections, the

inneronepof said sections being adapted to ing the latter in unison upon actuation otv said ring, said plates adapted to beheld against movement by the magnetic forces.

produced in said Outer section.v y

9. ln a device ot the character described, a spindle having a chuck tace of two sec tions` one within the other, a separate coil associated witli'each section for ymagnetizing the saine, a pair of oppositely arranged plates supported by the outer section for sliding movement towards and away from cach other, said plates having angular slots in their uter ends, and a rotatable ring about said chuck face provided with pins engaging in said slots.

10. A magnetic chuck` comprising a pair ot' sections, one withinthe other, means for separately magnetizing said sections, the

inner one of said sections being adapted to directly hold ay piece ot' ,work by the malgiietic effects within said section, and wor i supporting devices associated `with the' outer ot lsaid sections and adapted to be held by the magnetic forces therein.

11. A rotary magnetic chuck comprising a pair of sections one within the other,

`means for separately magnetizing'said sections, the central section being removable and having an 'axial unfilled recess in'its face, and Work supporting devices associ ated with the outer section. v

12. A- magnetic chuck, comprising a rotary spindle having a chuck face made up ot `two sections, the outer section being provided with a central recess within which is tittcd a central chuck block, 4said. central chuck block being removable and having a centi-allyl disposed recess, and supporting devices for the work associated with the nii-ter section and adapted to be held by the magnetic forces therein.

BENGT M. w. Hanson. 

